I have 2 antennas mounted on opposite ends of a roof and both of them feed commercial GPS DA/splitters and I can have as many as 10 receivers running at one time for testing. I have also used one of the high frequency type F TV passive splitters with one D.C. feed through and added 200-300 ohm resistors from the other outputs to ground. All this has seemed to work just fine but one of the older receivers apparently radiated its L.O. out the antenna coax and would interfere with a couple of other receivers I connected to the same DA.
Connecting one 10 Mhz references to the external trigger on my scope and feeding 2 other GPS receivers to the input channels (all from the same antenna DA), I can watch the slow drift at 2 ns/div with respect to the trigger and sometimes one receiver drift one way as the other receiver drifts in the opposite direction and sometimes they drift the same way. The drift is generally less than 2 ns but it is there and I assume it depends on what the internal ‘housekeeping’ of the receiver is doing and what birds they are using. So bottom line, they aren’t ‘locked’ to each other but are generally close. -Arthur _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
